My mother is a diagnosed case of carcinoma right breast. Her surgery has been done on 28.05.2017 at Delhi where her infected breast has been removed completely. And doctor has said after seeing biopsy report that only chemotherapy will be done radiation not required. And we started her chemotherapy at kolkata from different doctor as Kolkata is near to my hometown And her 6th and last chemo therapy is over on 11.10.2017. Biopsy report says that my mother breast cancer cell her 2/neu is 3+ and comment Her 2 gene amplification issue at18-20% of invasive breast cancer as per biopsy report. Staging is-mpT2N0Mx. The whole body scan pet has been done where its found that cancer has not spread to any other part of body. The consulting chemotherapy doctor also initially said that only chemotherapy will be done no radiation required but now when 6th last chemotherapy is over he is saying that radiation will also be done. Which will continue for 3 week 5 days each week. Please help sir/mam why he is suggesting it now? Is that for business purpose only? Whats is side effect of radiation Plss pls guide sir/mam. Thanks in advance.